qstyleoption.h

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QSTYLEOPTION_H
#define QSTYLEOPTION_H
 
#include <QtWidgets/qtwidgetsglobal.h>
#include <QtCore/qlocale.h>
#include <QtCore/qvariant.h>
#if QT_CONFIG(spinbox)
#include <QtWidgets/qabstractspinbox.h>
#endif
#include <QtGui/qicon.h>
#include <QtGui/qtransform.h>
#if QT_CONFIG(slider)
#include <QtWidgets/qslider.h>
#endif
#include <QtWidgets/qstyle.h>
#if QT_CONFIG(tabbar)
#include <QtWidgets/qtabbar.h>
#endif
#if QT_CONFIG(tabwidget)
#include <QtWidgets/qtabwidget.h>
#endif
#if QT_CONFIG(rubberband)
#include <QtWidgets/qrubberband.h>
#endif
#include <QtWidgets/qframe.h>
#if QT_CONFIG(itemviews)
#   include <QtCore/qabstractitemmodel.h>
#endif
 
QT_BEGIN_NAMESPACE
 
 
class QDebug;
 
class Q_WIDGETS_EXPORT QStyleOption
{
public:
    enum OptionType {
                      SO_Default, SO_FocusRect, SO_Button, SO_Tab, SO_MenuItem,
                      SO_Frame, SO_ProgressBar, SO_ToolBox, SO_Header,
                      SO_DockWidget, SO_ViewItem, SO_TabWidgetFrame,
                      SO_TabBarBase, SO_RubberBand, SO_ToolBar, SO_GraphicsItem,
 
                      SO_Complex = 0xf0000, SO_Slider, SO_SpinBox, SO_ToolButton, SO_ComboBox,
                      SO_TitleBar, SO_GroupBox, SO_SizeGrip,
 
                      SO_CustomBase = 0xf00,
                      SO_ComplexCustomBase = 0xf000000
                    };
 
    enum StyleOptionType { Type = SO_Default };
    enum StyleOptionVersion { Version = 1 };
 
    int version;
    int type;
    QStyle::State state;
    Qt::LayoutDirection direction;
    QRect rect;
    QFontMetrics fontMetrics;
    QPalette palette;
    QObject *styleObject;
 
    QStyleOption(int version = QStyleOption::Version, int type = SO_Default);
    QStyleOption(const QStyleOption &other);
    ~QStyleOption();
 
    void initFrom(const QWidget *w);
    QStyleOption &operator=(const QStyleOption &other);
};
 
class Q_WIDGETS_EXPORT QStyleOptionFocusRect : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_FocusRect };
    enum StyleOptionVersion { Version = 1 };
 
    QColor backgroundColor;
 
    QStyleOptionFocusRect();
    QStyleOptionFocusRect(const QStyleOptionFocusRect &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionFocusRect &operator=(const QStyleOptionFocusRect &) = default;
 
protected:
    QStyleOptionFocusRect(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionFrame : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_Frame };
    enum StyleOptionVersion { Version = 1 };
 
    int lineWidth;
    int midLineWidth;
    enum FrameFeature {
        None = 0x00,
        Flat = 0x01,
        Rounded = 0x02
    };
    Q_DECLARE_FLAGS(FrameFeatures, FrameFeature)
    FrameFeatures features;
    QFrame::Shape frameShape;
 
    QStyleOptionFrame();
    QStyleOptionFrame(const QStyleOptionFrame &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionFrame &operator=(const QStyleOptionFrame &) = default;
 
protected:
    QStyleOptionFrame(int version);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QStyleOptionFrame::FrameFeatures)
 
#if QT_CONFIG(tabwidget)
class Q_WIDGETS_EXPORT QStyleOptionTabWidgetFrame : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_TabWidgetFrame };
    enum StyleOptionVersion { Version = 1 };
 
    int lineWidth;
    int midLineWidth;
    QTabBar::Shape shape;
    QSize tabBarSize;
    QSize rightCornerWidgetSize;
    QSize leftCornerWidgetSize;
    QRect tabBarRect;
    QRect selectedTabRect;
 
    QStyleOptionTabWidgetFrame();
    inline QStyleOptionTabWidgetFrame(const QStyleOptionTabWidgetFrame &other)
        : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionTabWidgetFrame &operator=(const QStyleOptionTabWidgetFrame &) = default;
 
protected:
    QStyleOptionTabWidgetFrame(int version);
};
 
#endif // QT_CONFIG(tabwidget)
 
 
#if QT_CONFIG(tabbar)
class Q_WIDGETS_EXPORT QStyleOptionTabBarBase : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_TabBarBase };
    enum StyleOptionVersion { Version = 1 };
 
    QTabBar::Shape shape;
    QRect tabBarRect;
    QRect selectedTabRect;
    bool documentMode;
 
    QStyleOptionTabBarBase();
    QStyleOptionTabBarBase(const QStyleOptionTabBarBase &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionTabBarBase &operator=(const QStyleOptionTabBarBase &) = default;
 
protected:
    QStyleOptionTabBarBase(int version);
};
 
#endif // QT_CONFIG(tabbar)
 
class Q_WIDGETS_EXPORT QStyleOptionHeader : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_Header };
    enum StyleOptionVersion { Version = 1 };
 
    enum SectionPosition { Beginning, Middle, End, OnlyOneSection };
    enum SelectedPosition { NotAdjacent, NextIsSelected, PreviousIsSelected,
                            NextAndPreviousAreSelected };
    enum SortIndicator { None, SortUp, SortDown };
 
    int section;
    QString text;
    Qt::Alignment textAlignment;
    QIcon icon;
    Qt::Alignment iconAlignment;
    SectionPosition position;
    SelectedPosition selectedPosition;
    SortIndicator sortIndicator;
    Qt::Orientation orientation;
 
    QStyleOptionHeader();
    QStyleOptionHeader(const QStyleOptionHeader &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionHeader &operator=(const QStyleOptionHeader &) = default;
 
protected:
    QStyleOptionHeader(int version);
};
 
// ### Qt7: merge with QStyleOptionHeader
class Q_WIDGETS_EXPORT QStyleOptionHeaderV2 : public QStyleOptionHeader
{
public:
    enum StyleOptionType { Type = SO_Header };
    enum StyleOptionVersion { Version = 2 };
 
    QStyleOptionHeaderV2();
    QStyleOptionHeaderV2(const QStyleOptionHeaderV2 &other) : QStyleOptionHeader(Version) { *this = other; }
    QStyleOptionHeaderV2 &operator=(const QStyleOptionHeaderV2 &) = default;
 
    Qt::TextElideMode textElideMode:2;
    bool isSectionDragTarget:1;
    int unused:29;
 
protected:
    QStyleOptionHeaderV2(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionButton : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_Button };
    enum StyleOptionVersion { Version = 1 };
 
    enum ButtonFeature { None = 0x00, Flat = 0x01, HasMenu = 0x02, DefaultButton = 0x04,
                         AutoDefaultButton = 0x08, CommandLinkButton = 0x10  };
    Q_DECLARE_FLAGS(ButtonFeatures, ButtonFeature)
 
    ButtonFeatures features;
    QString text;
    QIcon icon;
    QSize iconSize;
 
    QStyleOptionButton();
    QStyleOptionButton(const QStyleOptionButton &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionButton &operator=(const QStyleOptionButton &) = default;
 
protected:
    QStyleOptionButton(int version);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QStyleOptionButton::ButtonFeatures)
 
#if QT_CONFIG(tabbar)
class Q_WIDGETS_EXPORT QStyleOptionTab : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_Tab };
    enum StyleOptionVersion { Version = 1 };
 
    enum TabPosition { Beginning, Middle, End, OnlyOneTab, Moving };
    enum SelectedPosition { NotAdjacent, NextIsSelected, PreviousIsSelected };
    enum CornerWidget { NoCornerWidgets = 0x00, LeftCornerWidget = 0x01,
                        RightCornerWidget = 0x02 };
    enum TabFeature { None = 0x00, HasFrame = 0x01, MinimumSizeHint = 0x02 };
    Q_DECLARE_FLAGS(CornerWidgets, CornerWidget)
    Q_DECLARE_FLAGS(TabFeatures, TabFeature)
 
    QTabBar::Shape shape;
    QString text;
    QIcon icon;
    int row;
    TabPosition position;
    SelectedPosition selectedPosition;
    CornerWidgets cornerWidgets;
    QSize iconSize;
    bool documentMode;
    QSize leftButtonSize;
    QSize rightButtonSize;
    TabFeatures features;
    int tabIndex = -1;
 
    QStyleOptionTab();
    QStyleOptionTab(const QStyleOptionTab &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionTab &operator=(const QStyleOptionTab &) = default;
 
protected:
    QStyleOptionTab(int version);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QStyleOptionTab::CornerWidgets)
 
#endif // QT_CONFIG(tabbar)
 
 
#if QT_CONFIG(toolbar)
 
class Q_WIDGETS_EXPORT QStyleOptionToolBar : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_ToolBar };
    enum StyleOptionVersion { Version = 1 };
    enum ToolBarPosition { Beginning, Middle, End, OnlyOne };
    enum ToolBarFeature { None = 0x0, Movable = 0x1 };
    Q_DECLARE_FLAGS(ToolBarFeatures, ToolBarFeature)
    ToolBarPosition positionOfLine; // The toolbar line position
    ToolBarPosition positionWithinLine; // The position within a toolbar
    Qt::ToolBarArea toolBarArea; // The toolbar docking area
    ToolBarFeatures features;
    int lineWidth;
    int midLineWidth;
    QStyleOptionToolBar();
    QStyleOptionToolBar(const QStyleOptionToolBar &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionToolBar &operator=(const QStyleOptionToolBar &) = default;
 
protected:
    QStyleOptionToolBar(int version);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QStyleOptionToolBar::ToolBarFeatures)
 
#endif // QT_CONFIG(toolbar)
 
class Q_WIDGETS_EXPORT QStyleOptionProgressBar : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_ProgressBar };
    enum StyleOptionVersion { Version = 1 };
 
    int minimum;
    int maximum;
    int progress;
    QString text;
    Qt::Alignment textAlignment;
    bool textVisible;
    bool invertedAppearance;
    bool bottomToTop;
 
    QStyleOptionProgressBar();
    QStyleOptionProgressBar(const QStyleOptionProgressBar &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionProgressBar &operator=(const QStyleOptionProgressBar &) = default;
 
protected:
    QStyleOptionProgressBar(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionMenuItem : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_MenuItem };
    enum StyleOptionVersion { Version = 1 };
 
    enum MenuItemType { Normal, DefaultItem, Separator, SubMenu, Scroller, TearOff, Margin,
                        EmptyArea };
    enum CheckType { NotCheckable, Exclusive, NonExclusive };
 
    MenuItemType menuItemType;
    CheckType checkType;
    bool checked;
    bool menuHasCheckableItems;
    QRect menuRect;
    QString text;
    QIcon icon;
    int maxIconWidth;
    int reservedShortcutWidth;
    QFont font;
 
    QStyleOptionMenuItem();
    QStyleOptionMenuItem(const QStyleOptionMenuItem &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionMenuItem &operator=(const QStyleOptionMenuItem &) = default;
 
protected:
    QStyleOptionMenuItem(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionDockWidget : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_DockWidget };
    enum StyleOptionVersion { Version = 1 };
 
    QString title;
    bool closable;
    bool movable;
    bool floatable;
    bool verticalTitleBar;
 
    QStyleOptionDockWidget();
    QStyleOptionDockWidget(const QStyleOptionDockWidget &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionDockWidget &operator=(const QStyleOptionDockWidget &) = default;
 
protected:
    QStyleOptionDockWidget(int version);
};
 
#if QT_CONFIG(itemviews)
 
class Q_WIDGETS_EXPORT QStyleOptionViewItem : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_ViewItem };
    enum StyleOptionVersion { Version = 1 };
 
    enum Position { Left, Right, Top, Bottom };
 
    Qt::Alignment displayAlignment;
    Qt::Alignment decorationAlignment;
    Qt::TextElideMode textElideMode;
    Position decorationPosition;
    QSize decorationSize;
    QFont font;
    bool showDecorationSelected;
 
    enum ViewItemFeature {
        None = 0x00,
        WrapText = 0x01,
        Alternate = 0x02,
        HasCheckIndicator = 0x04,
        HasDisplay = 0x08,
        HasDecoration = 0x10,
        IsDecoratedRootColumn = 0x20,
        IsDecorationForRootColumn = 0x40,
    };
    Q_DECLARE_FLAGS(ViewItemFeatures, ViewItemFeature)
 
    ViewItemFeatures features;
 
    QLocale locale;
    const QWidget *widget;
 
    enum ViewItemPosition { Invalid, Beginning, Middle, End, OnlyOne };
 
    QModelIndex index;
    Qt::CheckState checkState;
    QIcon icon;
    QString text;
    ViewItemPosition viewItemPosition;
    QBrush backgroundBrush;
 
    QStyleOptionViewItem();
    QStyleOptionViewItem(const QStyleOptionViewItem &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionViewItem &operator=(const QStyleOptionViewItem &) = default;
 
protected:
    QStyleOptionViewItem(int version);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QStyleOptionViewItem::ViewItemFeatures)
 
#endif // QT_CONFIG(itemviews)
 
class Q_WIDGETS_EXPORT QStyleOptionToolBox : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_ToolBox };
    enum StyleOptionVersion { Version = 1 };
 
    QString text;
    QIcon icon;
 
    enum TabPosition { Beginning, Middle, End, OnlyOneTab };
    enum SelectedPosition { NotAdjacent, NextIsSelected, PreviousIsSelected };
 
    TabPosition position;
    SelectedPosition selectedPosition;
 
    QStyleOptionToolBox();
    QStyleOptionToolBox(const QStyleOptionToolBox &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionToolBox &operator=(const QStyleOptionToolBox &) = default;
 
protected:
    QStyleOptionToolBox(int version);
};
 
#if QT_CONFIG(rubberband)
class Q_WIDGETS_EXPORT QStyleOptionRubberBand : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_RubberBand };
    enum StyleOptionVersion { Version = 1 };
 
    QRubberBand::Shape shape;
    bool opaque;
 
    QStyleOptionRubberBand();
    QStyleOptionRubberBand(const QStyleOptionRubberBand &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionRubberBand &operator=(const QStyleOptionRubberBand &) = default;
 
protected:
    QStyleOptionRubberBand(int version);
};
#endif // QT_CONFIG(rubberband)
 
// -------------------------- Complex style options -------------------------------
class Q_WIDGETS_EXPORT QStyleOptionComplex : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_Complex };
    enum StyleOptionVersion { Version = 1 };
 
    QStyle::SubControls subControls;
    QStyle::SubControls activeSubControls;
 
    QStyleOptionComplex(int version = QStyleOptionComplex::Version, int type = SO_Complex);
    QStyleOptionComplex(const QStyleOptionComplex &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionComplex &operator=(const QStyleOptionComplex &) = default;
};
 
#if QT_CONFIG(slider)
class Q_WIDGETS_EXPORT QStyleOptionSlider : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_Slider };
    enum StyleOptionVersion { Version = 1 };
 
    Qt::Orientation orientation;
    int minimum;
    int maximum;
    QSlider::TickPosition tickPosition;
    int tickInterval;
    bool upsideDown;
    int sliderPosition;
    int sliderValue;
    int singleStep;
    int pageStep;
    qreal notchTarget;
    bool dialWrapping;
    Qt::KeyboardModifiers keyboardModifiers;
 
    QStyleOptionSlider();
    QStyleOptionSlider(const QStyleOptionSlider &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionSlider &operator=(const QStyleOptionSlider &) = default;
 
protected:
    QStyleOptionSlider(int version);
};
#endif // QT_CONFIG(slider)
 
#if QT_CONFIG(spinbox)
class Q_WIDGETS_EXPORT QStyleOptionSpinBox : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_SpinBox };
    enum StyleOptionVersion { Version = 1 };
 
    QAbstractSpinBox::ButtonSymbols buttonSymbols;
    QAbstractSpinBox::StepEnabled stepEnabled;
    bool frame;
 
    QStyleOptionSpinBox();
    QStyleOptionSpinBox(const QStyleOptionSpinBox &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionSpinBox &operator=(const QStyleOptionSpinBox &) = default;
 
protected:
    QStyleOptionSpinBox(int version);
};
#endif // QT_CONFIG(spinbox)
 
class Q_WIDGETS_EXPORT QStyleOptionToolButton : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_ToolButton };
    enum StyleOptionVersion { Version = 1 };
 
    enum ToolButtonFeature { None = 0x00, Arrow = 0x01, Menu = 0x04, MenuButtonPopup = Menu, PopupDelay = 0x08,
                             HasMenu = 0x10 };
    Q_DECLARE_FLAGS(ToolButtonFeatures, ToolButtonFeature)
 
    ToolButtonFeatures features;
    QIcon icon;
    QSize iconSize;
    QString text;
    Qt::ArrowType arrowType;
    Qt::ToolButtonStyle toolButtonStyle;
    QPoint pos;
    QFont font;
 
    QStyleOptionToolButton();
    QStyleOptionToolButton(const QStyleOptionToolButton &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionToolButton &operator=(const QStyleOptionToolButton &) = default;
 
protected:
    QStyleOptionToolButton(int version);
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QStyleOptionToolButton::ToolButtonFeatures)
 
class Q_WIDGETS_EXPORT QStyleOptionComboBox : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_ComboBox };
    enum StyleOptionVersion { Version = 1 };
 
    bool editable;
    QRect popupRect;
    bool frame;
    QString currentText;
    QIcon currentIcon;
    QSize iconSize;
    Qt::Alignment textAlignment = Qt::AlignLeft | Qt::AlignVCenter;
 
    QStyleOptionComboBox();
    QStyleOptionComboBox(const QStyleOptionComboBox &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionComboBox &operator=(const QStyleOptionComboBox &) = default;
 
protected:
    QStyleOptionComboBox(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionTitleBar : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_TitleBar };
    enum StyleOptionVersion { Version = 1 };
 
    QString text;
    QIcon icon;
    int titleBarState;
    Qt::WindowFlags titleBarFlags;
 
    QStyleOptionTitleBar();
    QStyleOptionTitleBar(const QStyleOptionTitleBar &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionTitleBar &operator=(const QStyleOptionTitleBar &) = default;
 
protected:
    QStyleOptionTitleBar(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionGroupBox : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_GroupBox };
    enum StyleOptionVersion { Version = 1 };
 
    QStyleOptionFrame::FrameFeatures features;
    QString text;
    Qt::Alignment textAlignment;
    QColor textColor;
    int lineWidth;
    int midLineWidth;
 
    QStyleOptionGroupBox();
    QStyleOptionGroupBox(const QStyleOptionGroupBox &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionGroupBox &operator=(const QStyleOptionGroupBox &) = default;
protected:
    QStyleOptionGroupBox(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionSizeGrip : public QStyleOptionComplex
{
public:
    enum StyleOptionType { Type = SO_SizeGrip };
    enum StyleOptionVersion { Version = 1 };
 
    Qt::Corner corner;
 
    QStyleOptionSizeGrip();
    QStyleOptionSizeGrip(const QStyleOptionSizeGrip &other) : QStyleOptionComplex(Version, Type) { *this = other; }
    QStyleOptionSizeGrip &operator=(const QStyleOptionSizeGrip &) = default;
protected:
    QStyleOptionSizeGrip(int version);
};
 
class Q_WIDGETS_EXPORT QStyleOptionGraphicsItem : public QStyleOption
{
public:
    enum StyleOptionType { Type = SO_GraphicsItem };
    enum StyleOptionVersion { Version = 1 };
 
    QRectF exposedRect;
 
    QStyleOptionGraphicsItem();
    QStyleOptionGraphicsItem(const QStyleOptionGraphicsItem &other) : QStyleOption(Version, Type) { *this = other; }
    QStyleOptionGraphicsItem &operator=(const QStyleOptionGraphicsItem &) = default;
    static qreal levelOfDetailFromTransform(const QTransform &worldTransform);
protected:
    QStyleOptionGraphicsItem(int version);
};
 
template <typename T>
T qstyleoption_cast(const QStyleOption *opt)
{
    typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type Opt;
    if (opt && opt->version >= Opt::Version && (opt->type == Opt::Type
        || int(Opt::Type) == QStyleOption::SO_Default
        || (int(Opt::Type) == QStyleOption::SO_Complex
            && opt->type > QStyleOption::SO_Complex)))
        return static_cast<T>(opt);
    return nullptr;
}
 
template <typename T>
T qstyleoption_cast(QStyleOption *opt)
{
    typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type Opt;
    if (opt && opt->version >= Opt::Version && (opt->type == Opt::Type
        || int(Opt::Type) == QStyleOption::SO_Default
        || (int(Opt::Type) == QStyleOption::SO_Complex
            && opt->type > QStyleOption::SO_Complex)))
        return static_cast<T>(opt);
    return nullptr;
}
 
// -------------------------- QStyleHintReturn -------------------------------
class Q_WIDGETS_EXPORT QStyleHintReturn {
public:
    enum HintReturnType {
        SH_Default=0xf000, SH_Mask, SH_Variant
    };
 
    enum StyleOptionType { Type = SH_Default };
    enum StyleOptionVersion { Version = 1 };
 
    QStyleHintReturn(int version = QStyleOption::Version, int type = SH_Default);
    ~QStyleHintReturn();
 
    int version;
    int type;
};
 
class Q_WIDGETS_EXPORT QStyleHintReturnMask : public QStyleHintReturn {
public:
    enum StyleOptionType { Type = SH_Mask };
    enum StyleOptionVersion { Version = 1 };
 
    QStyleHintReturnMask();
    ~QStyleHintReturnMask();
 
    QRegion region;
};
 
class Q_WIDGETS_EXPORT QStyleHintReturnVariant : public QStyleHintReturn {
public:
    enum StyleOptionType { Type = SH_Variant };
    enum StyleOptionVersion { Version = 1 };
 
    QStyleHintReturnVariant();
    ~QStyleHintReturnVariant();
 
    QVariant variant;
};
 
template <typename T>
T qstyleoption_cast(const QStyleHintReturn *hint)
{
    typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type Opt;
    if (hint && hint->version <= Opt::Version &&
        (hint->type == Opt::Type || int(Opt::Type) == QStyleHintReturn::SH_Default))
        return static_cast<T>(hint);
    return nullptr;
}
 
template <typename T>
T qstyleoption_cast(QStyleHintReturn *hint)
{
    typedef typename std::remove_cv<typename std::remove_pointer<T>::type>::type Opt;
    if (hint && hint->version <= Opt::Version &&
        (hint->type == Opt::Type || int(Opt::Type) == QStyleHintReturn::SH_Default))
        return static_cast<T>(hint);
    return nullptr;
}
 
#if !defined(QT_NO_DEBUG_STREAM)
Q_WIDGETS_EXPORT QDebug operator<<(QDebug debug, const QStyleOption::OptionType &optionType);
Q_WIDGETS_EXPORT QDebug operator<<(QDebug debug, const QStyleOption &option);
#endif
 
QT_END_NAMESPACE
 
#endif // QSTYLEOPTION_H